Oh dear, another nerf. Notice how that just seems to be the norm these days? Well this time, it's actually a very minor one but it feels like infernal rain on the WoW Forums.

Blizzard guy, Tseric's patience was certainly (sorely) tried as he explained the changes made to the Frost Nova. Apparently, Frost Nova's rooting (frozen status) was supposed to break after a critical attack. Previously, players were able to do chain critical attacks with Shatter (increases crit attack to frozen targets) and Ice Lance (instant cast that does enhanced damage to rooted opponents). There's always a chance of a frozen target breaking under normal attacks and apparently, it IS intended to have it break under crit.

Tseric had this to say though:

However, the usage of Ice Lance made it very noticeable that being frozen was persisting through being crit, whereas normal damage had a chance to break the state. By insuring that a crit will break the frozen state, back to back crits from Ice Lance won't be occurring and such spikes in damage disappear.